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Left-right organizer flow dynamics: how much cilia activity reliably yields laterality?

Pedro Sampaio1, Rita R Ferreira1, Adán Guerrero2

  • 1CEDOC, Faculdade de Ciências Médicas, Universidade Nova de Lisboa, 1169-056 Lisboa, Portugal.

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Embryonic motile cilia generate left-right body asymmetry by creating directional fluid flow. This study shows cilia number and flow patterns are key predictors of organ positioning (situs solitus).

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Area of Science:

  • Developmental Biology
  • Biophysics

Background:

  • Internal organ positioning is asymmetric in vertebrates.
  • Embryonic motile cilia in the left-right organizer generate directional fluid flow, crucial for establishing this asymmetry.
  • The precise relationship between fluid flow dynamics and organ laterality requires detailed characterization.

Purpose of the Study:

  • To experimentally investigate how fluid flow dynamics generated by embryonic cilia influence organ laterality.
  • To determine the critical parameters of cilia function and fluid flow that predict situs solitus.

Main Methods:

  • Utilized zebrafish genetics to create diverse fluid flow dynamics by manipulating motile cilia.
  • Employed mosaic organizers with varying proportions of motile and immotile cilia (via dnah7 knockdowns).
  • Integrated fluid dynamics simulations to analyze experimental data and model flow patterns.

Main Results:

  • Asymmetric fluid flow in the left-right organizer was confirmed as a strong predictor of organ laterality.
  • Simulations indicated that fluid flow from approximately 30 cilia predicts 90% situs solitus, aligning with experimental findings.
  • Identified cilia number, dorsal anterior clustering, and leftward flow as critical factors for establishing situs solitus.

Conclusions:

  • Cilia-driven fluid flow is essential for establishing vertebrate left-right body asymmetry.
  • Specific parameters of cilia number, arrangement, and resultant flow directionality are critical for correct organ positioning.
  • Asymmetric charon expression is a downstream consequence of these critical flow dynamics, ensuring proper situs solitus.